MODEL 420 modem/telephone/ISDN Settings and Configuration

CONNECTIONS
Purpose	Location	Purpose	Location
DC power	CN1	Receive	CN4
RS-232/422	CN2	Transmit	CN5
Ground	CN3

CARRIER ON
Setting	SW2/C
» Always on	On
RTS high	Off

GROUND
Setting	JP1
» Frame and signal ground connected	Pins 1 & 2 closed
Frame and signal ground separate	Pins 3 & 4 closed

IMPEDANCE
Setting	JP2
» 135 Ohms(low)	Pins 1 & 4 closed
High	Pins 3 & 4 closed

LINE SPEED
Speed	SW1/A	SW1/B	SW1/C	SW1/D	SW1/E	SW1/F
32Kbps	Up	Down	Down	Down	Down	Down
48Kbps	Down	Up	Down	Down	Down	Down
56Kbps	Down	Down	Up	Down	Down	Down
» 64Kbps	Down	Down	Down	Up	Down	Down
72Kbps	Down	Down	Down	Down	Up	Down
128Kbps	Down	Down	Down	Down	Down	Up

RECEIVE CLOCK
Setting	SW/H
» Disabled	Down
Enabled	Up

RTS/CTS DELAY
Setting	SW2/A	SW2/B
» Disabled	Off	Off
7ms	On	Off
60ms	Off	On

TRANSMIT CLOCK SOURCE
Setting	SW1/G
» Internal	Down
External	Up

FACTORY CONFIGURED SETTINGS
Jumper	Setting
SW2/D	Not used

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
PWR	Red	On	Power is on
PWR	Red	Off	Power is off
TD	Red	On	Modem is transmitting data
TD	Red	Off	Modem is not transmitting data
RD	Red	On	Modem is receiving data
RD	Red	Off	Modem is not receiving data
RTS	Red	On	RTS signal is high
RTS	Red	Off	RTS signal is low
DCD	Red	On	Carrier signal detected
DCD	Red	Off	Carrier signal not detected
TM	Red	On	Modem is in test mode
TM	Red	Off	Modem is in test mode